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Chewbacka

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Chewbacka last won the day on December 12 2016

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    Automotive Quality engineer - retired
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  1. On my iPad I can’t hover, but if I touch the WB it opens a search bar containing WB at the bottom of the screen, if I tap search it’s first suggestion for WB is WarnerBrothers. I like the idea, but not there yet.
  2. That’s because the density of propane is lower, so a full bottle weighs less
  3. I also thought you should never reheat rice, but according to NHS web site, so long as ‘unwanted’ cooked rice is in the fridge within an hour and kept chilled until reheated the next day the risk is low. https://www.nhs.uk/common-health-questions/food-and-diet/can-reheating-rice-cause-food-poisoning/
  4. Well that was the most pointless video I have watched this year.
  5. So my slow kettle will take even longer to boil. Why don’t they just leave things alone??
  6. I remember reading that fishing boats above a certain size must comply, but I don’t remember where I saw it
  7. If they claim compliance with the iso std then yes, though I would have to check the iso std to see if Inland waterways boats are exempt. But even if there is no exemption, and as the marine regulator costs about double, and as narrowboats are self certified then I can only guess...........
  8. The reason ‘normal’ regulators are marked ‘not for boats’ is I think to do with section 5.2 above. Specifically the need to have an ‘over pressure’ device to prevent high pressure gas entering the boat gas system should the regulator fail. Though from memory the bss does not require this, though it is law for certain salty water boats. something like this - https://gasproducts.co.uk/gas-regulators/marine-gas-regulators/gasboat-marine-30mbar-gas-regulator-bulkhead.html you can see the gas escape port at 12 o’clock
  9. It is worth pointing out that as it is a high capacity pump it has a 1 1/8inch (approx 28mm) outlet, there is a good chance your existing pump uses a 3/4” pipe. In which case............
  10. Unless she was working on it live and gave the pump motor a brief power connection which (depending on pump design) could generate enough back emf to feel. added - I bet this switch is still in use in 5 years time. Grow to love it’s interesting aesthetics........
  11. To answer the question, you don’t need a non return valve, it’s just something to block and cause trouble. Most (all?) bilge pumps don’t pump out everything, mine leaves about an inch of water. The official reason is that any oil or grease in the bilge will float on the surface and not be pumped out into the canal, you just pump out the water below, but actually it’s because it is expensive to make a float switch that is sensitive enough to pump it dry without leaving the pump running forever. That is indeed an automatic pump
  12. The items linked to are not load testers, and don’t draw massive currents. They claim to be able to measure the internal resistance (from which they calculate CCA) and then using clever algorithms and impressed currents calculate health of the battery (based on remaining capacity and CCA). When I worked for one of the car manufacturers a battery warranty claim would only be accepted with a midtronics tester print out showing replace. So certainly some of these are capable of identifying a ‘no good’ battery, but as to accurately measuring capacity, I don’t know how accurate they are.
  13. For capacity I leave the battery on a trickle charger until I know it’s fully charged, then connect it to a load, say a couple of bulbs to give a load of about 10A. The current will drop with voltage, but I measure the current and volts every 30mins (give or take) and roughly calculate the amp hours every time. For my 110Ah batteries I would stop when I get to about 50Ah as that means the battery is still serviceable, but so far this test has confirmed my knackered batteries are indeed knackered (best was just over 20Ah).
  14. If your circulation pipes are plastic and don’t have a barrier layer, oxygen can diffuse through the pipe walls encouraging corrosion of rads and possibly helping ‘bugs’ to grow. Copper on the other hand is a natural biocide.
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